summing long int, C (gcc)

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//gcc 7.4.0

#include  <stdio.h>
#include <stdbool.h>
#include <util/delay.h>

unsigned int v30sns          = 0;          // used in ADC for sensing battery volt
unsigned int v30sns_lowest   = 4095;       // used in ADC for sensing battery volt
unsigned int v30sns_highest  = 0;          // used in ADC for sensing battery volt
unsigned int v30sns_mean     = 0;          // used in ADC for sensing battery volt
unsigned long v30sns_sum     = 0;          // used in ADC for sensing battery volt
unsigned int v30sns_count    = 0;          // used in ADC for sensing battery volt
bool         v30sns_ready    = false;      // used in ADC for sensing battery volt

extern unsigned int adc(void);

int main(void)
{
    printf("Hello, world!\n");
    
    
    while(1)
    {
        adc();
    
        if ( v30sns <= v30sns_lowest )   { v30sns_lowest = v30sns; }
        if ( v30sns >= v30sns_highest )  { v30sns_highest = v30sns; }
    
        printf(" lowest: %i v30sns: %i highest: %i count %i sum %i mean %i \r\n",
              v30sns_lowest, v30sns, v30sns_highest, v30sns_count, v30sns_sum, v30sns_mean );
        
        delayms(1000);
    }
    
    
    
    return 0;
} // end main()

unsigned int adc(void)
{
    unsigned int data = 0;

// Read the ADC conversion result
    ((unsigned char *) &data)[0] = 0x6A;
    ((unsigned char *) &data)[1] = 0x0E;

// sum data for averaging final result
    v30sns_sum   = v30sns_sum + (unsigned long) data;
    v30sns_count = v30sns_count + 1;

// average sum after a few convertions and update global variable
    if ( v30sns_count >= 254)
    {
        v30sns = v30sns_sum / v30sns_count;
        v30sns_count = 0;
        v30sns_ready = 1;
    }

return 0;
    // v30sns = data;
}

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Compilation time: 0.13 sec, absolute service time: 0,33 sec